Table

12V/24V DC Wire Run Length by Voltage Drop

12V/24V DC Wire Run Length by Voltage Drop reference with assumptions and boundary notes.

Reference boundary

Voltage-drop estimate only. It does not choose conductor ampacity, protection, battery fuse size, or product rating.

Reference table

Estimate one-way DC run length at a 3 percent voltage drop for selected copper conductors and currents.

Formula basis: one-way metres = allowed volt drop x area / (2 x resistivity x current), using copper at 20 C and 3 percent drop.
DC circuitCurrent (A)Copper sizeApprox. one-way length (m)
12 V DC1014 AWG2.2
12 V DC1012 AWG3.5
12 V DC1010 AWG5.5
12 V DC108 AWG8.7
12 V DC2014 AWG1.1
12 V DC2012 AWG1.7
12 V DC2010 AWG2.7
12 V DC208 AWG4.4
24 V DC1014 AWG4.3
24 V DC1012 AWG6.9
24 V DC1010 AWG11
24 V DC108 AWG17.5
24 V DC2014 AWG2.2
24 V DC2012 AWG3.5
24 V DC2010 AWG5.5
24 V DC208 AWG8.7
48 V DC2014 AWG4.3
48 V DC2012 AWG6.9
48 V DC2010 AWG11
48 V DC208 AWG17.5
Use notes
  • Use this table for preliminary reference and arithmetic checks only.
  • Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.